[fenix] For https://github.com/mozilla-mobile/fenix/issues/5547: Reuse biometricPrompt when authenticating

This fixes an issue with Samsung devices where an invisible DeviceCredentialHandler because the executor was "null" (it wasn't actually)

You *must* reuse the biometric object instead of creating a new one.

app/src/main/java/org/mozilla/fenix/settings/LoginsFragment.kt

@@ -36,10 +36,51 @@ import java.util.concurrent.Executors
 
 @Suppress("TooManyFunctions")
 class LoginsFragment : PreferenceFragmentCompat(), AccountObserver {
+
+    @TargetApi(M)
+    private lateinit var biometricPromptCallback: BiometricPrompt.AuthenticationCallback
+
+    @TargetApi(M)
+    private val executor = Executors.newSingleThreadExecutor()
+
+    @TargetApi(M)
+    private lateinit var biometricPrompt: BiometricPrompt
+
+    @TargetApi(M)
+    private lateinit var promptInfo: BiometricPrompt.PromptInfo
+
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
         setPreferencesFromResource(R.xml.logins_preferences, rootKey)
     }
 
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        biometricPromptCallback = object : BiometricPrompt.AuthenticationCallback() {
+
+            override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {
+                // Authentication Error
+            }
+
+            override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
+                lifecycleScope.launch(Main) {
+                    navigateToSavedLoginsFragment()
+                }
+            }
+
+            override fun onAuthenticationFailed() {
+                // Authenticated Failed
+            }
+        }
+
+        biometricPrompt = BiometricPrompt(this, executor, biometricPromptCallback)
+
+        promptInfo = BiometricPrompt.PromptInfo.Builder()
+            .setTitle(getString(R.string.logins_biometric_prompt_message))
+            .setDeviceCredentialAllowed(true)
+            .build()
+    }
+
     override fun onResume() {
         super.onResume()
         activity?.title = getString(R.string.preferences_passwords_logins_and_passwords)
@@ -48,7 +89,7 @@ class LoginsFragment : PreferenceFragmentCompat(), AccountObserver {
         val savedLoginsKey = getPreferenceKey(R.string.pref_key_saved_logins)
         findPreference<Preference>(savedLoginsKey)?.setOnPreferenceClickListener {
             if (Build.VERSION.SDK_INT >= M && isHardwareAvailable && hasBiometricEnrolled) {
-                showBiometricPrompt()
+                biometricPrompt.authenticate(promptInfo)
             } else {
                 verifyPinOrShowSetupWarning()
             }
@@ -137,37 +178,6 @@ class LoginsFragment : PreferenceFragmentCompat(), AccountObserver {
         }
     }
 
-    @TargetApi(M)
-    private fun showBiometricPrompt() {
-        val biometricPromptCallback = object : BiometricPrompt.AuthenticationCallback() {
-
-            override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {
-                // Authentication Error
-            }
-
-            override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
-                lifecycleScope.launch(Main) {
-                    navigateToSavedLoginsFragment()
-                }
-            }
-
-            override fun onAuthenticationFailed() {
-                // Authenticated Failed
-            }
-        }
-
-        val executor = Executors.newSingleThreadExecutor()
-
-        val biometricPrompt = BiometricPrompt(this, executor, biometricPromptCallback)
-
-        val promptInfo = BiometricPrompt.PromptInfo.Builder()
-            .setTitle(getString(R.string.logins_biometric_prompt_message))
-            .setDeviceCredentialAllowed(true)
-            .build()
-
-        biometricPrompt.authenticate(promptInfo)
-    }
-
     private fun verifyPinOrShowSetupWarning() {
         val manager = activity?.getSystemService(KEYGUARD_SERVICE) as KeyguardManager
         if (manager.isKeyguardSecure) {

buildSrc/src/main/java/Dependencies.kt

@@ -18,7 +18,7 @@ object Versions {
     const val osslicenses_library = "17.0.0"
 
     const val androidx_appcompat = "1.1.0"
-    const val androidx_biometric = "1.0.0-rc02"
+    const val androidx_biometric = "1.0.0"
     const val androidx_coordinator_layout = "1.1.0-beta01"
     const val androidx_constraint_layout = "2.0.0-beta2"
     const val androidx_preference = "1.1.0"